II. Grammar and Vocabulary: 12%
Directions: Beneath each of the following sentences there are four choices marked A, B, C and D. Choose the one answer that best completes the sentence.
17. China, a country with 145 million elderly people，will remain ____ ageing society during this century, according to ____ Chinese population experts.
A. /;the B. an;/ C. an;the D. the; /
